Ruger SR-556
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The SR-556 was a semi-automatic AR-15 style rifle manufactured by Sturm, Ruger & Co. The rifle was introduced in 2009 in.223 Remington/5.56×45mm NATO and as a.308 Winchester AR-10 variant in 2013, the
Ruger SR-556 - Standard Configuration (discontinued)
Firing the Ruger SR-556
Adjustable gas key on Ruger SR-556 piston rifle
Elements of Ruger SR-556 gas system
6.8mm Remington SPC
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The 6.8mm Remington Special Purpose Cartridge is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Un
Ruger SR-556
…in), chrome lined, and features a six groove, right hand, 1:230 mm (9 in) twist. In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge. Ruger's introduction of the SR-556 was met with some criticism for its high price tag of around US$2,000. Ruger products are usually known…
6.8 SPC (left), 5.56×45mm NATO (right)
10.4mm Swiss Vetterli Winchester